Apparatus for valving bags



2 Sheets-Sheet 1 lll i I;

L. Ha HARTMAN Filed Feb. 9, 1928 mm., Ww

APPARATUS kFOR VALVING BAGS Tri Aug.' 6, 1929.

gwwfnoz Louis H. Hoffman.

attoznm Aug. 6, 1929. H. HARTMANA APPARATUS FOR VALVING BAGS Filed Feb. 9, 1928 2 Sheets-Sheet 2 gwuentoz Loui HHarman.

Patented Aug., 6, 1929.

UNITED ,STATES lPMENT OFFICE. A

OF TOLEDO, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTSpTO ST.

, 01E' NEW YORK, N. Y.,

A CORPORATION OF NEW'YORK.

APPARATUS FOR VALVING- BAGS.

Application filed February 9, 1928, Serial No. 252,971.

This invention relates to apparatus for tucking in the corners of bags to form valves. The general purpose and operation of the device is similar to that disclosed in the patent to Bates, Dorr and Dansker, No. 1,623,- 228, issued April 5, 1927. This invention relates particularly to the -mounting and operation of the severaldevices for forming the valve, particularly the tucking-in linger.

The particular features of the improved construction will more fully appear as the Idescription proceeds, and will be pointed out in the appended claims.

Referring to the accompanying drawings `forming a part of this specilicatlon, Figure 1 is a plan view, with parts brokenaway, of one form ofapparatus embodying my invention; Fig. 2 is aside elevation of the apparatus disclosed in Fig. 1; Fig. 3 is an end View, and partly in section, of the apparatus Vshown in Figs. 1 and 2, loo 'ng at the right en d of the apparatus shown in thoseigures; Figs. 4 and 5 are sections on lines 4 4 and 5 5, respectively, ofy Fig. 2; Fig. 6 is a horizontal section substantially on the line 6 6 of Fig. 2; Fig. 7 is an enlarged somewhat diagrammatic view showing the operation of the spreading wings; Fig. 8 is a section through the clamping jaws substantially on the line 8 8 of Fig. 1.

The main operating parts of the valveformingpdevice consist of clamping jaws 10, which are adapted to seize the edge of a bag near one'end thereof where the valve is to be formed,.spreading wings 11, which are adapted to enter the gusset-fold of a bag between the clamp and the end of the bag to spread apart the gusset-fold, and tucking finger 12, which is adapted to tuck in the corner-of the bag after the gusset-fold has -been spread apart.

Clamping jaws 10 are mounted upon arms 13 fulcrumed at 14 and having rear extensions 15 connected by a spring 16 which normally holds the clamping members apart. Rollers 17 mounted in arms 13 are adapted to becontacted by cam members 18 on a slide rod 19, thus forcing apart the rear ends of members 13 against the tension of spring 16 and bringing. the clamping members 10 against the opposite sides of a bag placed therebetween.

Slide 19 is mounted in keepers 2() within a casing 21. A lever 22 has one end forked A26 in a cam wheel 27 011 The other end Vof lever to enclose a roller 23 adjustably mounted upon shde 19. Lever 22 is mounted upon a stationary fulcrum 24 and has at its other end a cam roller 25y running in a cam groove power shaft 28. flhe clamping jaws may be formed in any suitable way, but infthe construction shown 1n detail in Fig. 8, the members 29 which actually contact the bag are mounted on the en of screws 30 which may be locked in adjusted positions on arms 13 by means of lock nuts 31. -By this construction the distance apart of the jaws of the clamps may be accurately adjusted. Spreading wings 11 are mounted like hinges upon a pin 32. Links 33 connect the carriers of spreading wings 11 with a slide 34, which slides in casing 21 parallel with slide 19. A lever 35 has one end forked to receive a roller 36 adjustably mounted on slide 34. Lever 35 is fulcrumedat 37 and has a cam roller 38 at its other end working in a cam groove 39 in a cam wheel 40 on power shaft 28. Another cam wheel 41 ma be made in a separate member and boltedl to cam wheel 40, or may be nade integral therewith. A cam groove 42 incam wheel 41 operates a roller 43 on the end of a lever '44- fulcrumed at 45.

44 is forked to receive a roller 46 adjustablymounted upon a slide 47 which slides longitudinally of casing 21 parallel vwith slides 19 and 34. The end of slide 47 is providedwith teeth 48,l which mesh with a pinion 49 on a stub shaft 50. Stub' shaft 50 is mounted ina bracket 51 and bears upon its upper end a crank arm 52. Tuckingkflnger 12 is attached to the outer end of crank arm 52-by means of screws 53, or in any other suitable way.

Tucking finger 12 has an end 54 bent at such an angle as to lie normally arallel with the direction of movement of s ides 19, 34 and 47, which is parallel with the edge of a bag in position to be valved by the ap aratus. -As will be seen from Figs. 1 and) 6, the axis of shaft 50 is directly in line with the edge of end 54 of tucking finger 12. The end 54 is rounded at 55 and rests movably, but snugly, between end of pin 32.

Rollers 23, 36 and mounted on their convenient manner.

46 may be adjust-ably respective slides in any In the drawings, roller wear plates 56 in the mounted upon a block 58 slidable lengthwise of slide 47. The block may be fastened in adjustable position on the slide by means of set screw 59. Roller 36 is similarly mounted upon a block 6() held-in adjusted position on slide 34 by screws 61, and roller 23 is similarly mountedl upon a block 62 adjustable upon slide 19.

When slide 47 is operated, crank 52 is moved from its full line position to its dotted line position in Fig. 6 carrying Fig. 12 from its full line position to its dotted line positon in that figure. It will be readily seen that the finger moves about the axial line of stub shaft 50 so that it may turn the ,fabric of the bag directly at right angles about a single point. It will be further understood that if the finger were mounted to turn about a pivot passing through end 54 of the finger, it would be impossible to have the axis about which it turned directly against the edge of the bag. For this reason it would be impossibleto make as accurate a fold in the bag as is made by the tucking finger mounted in the manner herein disclosed.

By sliding the end of tucking finger 54 within a groove in the end of pin 32, it is possible tohave this free end of the tucking finger held securely in one plane while at the same time it is allowed to move about an axis in linewith its outer edge.

By operating each one of the three devices of the valver, that is, the clamping members, the spreading wings, and the tucking finger, by separately adjustable members and by cams which are rotated by the same'shaft,

but may be suitaly arranged with respect to each other', itis possibleto separately adjust the operation of any oneof these devices so as to time them in the exact relation to the timing of the other devices which is found to be most desirable. Furthermore, iii the construction disclosed herein, any one of the three devices mayybe readily removed and replaced by another without interfering with the other two devices, andA any. one of theA parts may be readjusted to take up wear, or for any other purpose, at any time without disturbing the adjustment of the otherftwo. Each device is requiredto stand the strain of performing its own operation only, and is not i subjected to any strain from the `operationl of the other devices.

It will be readily understoodl that various changes may be ade-in the construction described without departing from the scope of. the invention as set forth in the appended claims. .y j

' What I cla'mis:

1. In apparatus for forming valves in valve bags, comprising a tucking finger for folding in one corner of the bag, means for holding the finger normally parallel wit-h one side of the .bag,f' with its edge adjacent to the bag and substantially ir contact with the bag, and means for swinging the linger about an axis passing through its edge in contact with the bag.

2. In apparatus for folding valves in valve bags, a tucking finger having one edge normally parallel with an edge of the bag near one end thereof, a pivot at one'side of the plane. ofthe bag and having its axis perpendicular to the plane of the bag at the edge of the tucking finger, means supporting the linger upon said pivot, and means for and passing through the axial line of said pivot, and means for oscillating said pivot, crank arm and finger to tuck in the corner of a bag to form the valve.

4. A constructionin accordance with claim 3, wherein the end of the linger adjacent tlie axial line of the pivot is slidably mounted in a guidingslotted member adjacent the edge of the bag.

5. In apparatus for forming valves in valve bags, comprising a clamping member for clamping a bellows-folded edge of a bag near one corner thereof, spreading members for entering the bellows-fold of the bag and spreading it a art between the clamping members and tii e corner of the bag and a tuckinginger for tuckingin the end of the spread-apart end of the bellows-fold, means Y for moving the tucking finger about an axis perpendicular to the edge of the bag, and a pivot for the reading members perpendicular to the side of the bagand to the axial line aboutwhich the 'finger is moved, there being a slot in the end of said pivot ,member for receiving one end of the finger.

6. In apparatus for folding'a valve in a valve bag, a casingadapted to lie along'one side of a bag to be valved, clamping memadapted to clamp the side of the bag adjacent one corner thereof, spreading members adapted' to enter the t-fold of a bag-to be valved and sprea the fold apart between the clamping members and the corner of the bag, a inger adapted to fold in the read-apart end of the gusset-fold, three shdes supported by said casing and operating respectively' lthe clamps, the;`

spreading member and the finger, and s eprate means for operating each -of said slid. O 7. Apparatus in accordance withclaim 6, im which the means -for operating each 'of the sldes'comprises an adjustable device on the slide, a lever having one end connected connected with said device and a cam for to said device and a cam for oscillating said operatingthe lever, and there being a power lever. shaft upon which the cams for the three 10 8. Apparatusin accordance with claim 6, levers for the three slides are fixed. 5 in which the means for operating each of In testimony whereof I have hereunto said slides comprises a device adjustably signed my name to this specification. mounted on the slide, a lever having one end LOUIS H. HARTMAN. 

